Mironycheva-Tokareva N.P., Michajlova E.V., Vishnyakova E.K. TRANSFORMATION OF BOG ECOSYSTEM PLANT COVER UNDER HIGHWAY CONSTRUCTING ON TAIGA ZONE TERRITORY IN WESTERN SIBERIARecent commercial development of the territory by oil and gas enterprises has caused critical necessity for the region to be deeper studied, to get reliable information about modern condition of investigated object that enables to predict possible changes of ecological situation under natural and anthropogenic factors. The greatest demonstration of hydrolithogenic processes resulted by human activity is vast zones of underflooding and drying-out due to surface flow direction changing or breaking. These processes become more active while linear features (highways) are being laid over bog complexes. At present time one of the most important problems of nature management is to analyze human activity impact on the environment at the regional and local levels. Negative effects due to linear features constructing are among understudied problems. Plant cover changes of the underfloodings of different age have been investigated. The connection between space and time organization of underflooding bog geosystems is determined with changing of plant cover composition and its projective cover. It indicates environment changes and can be used for monitoring functioning of anthropogenic wetlands resulted from linear features constructing. Recovering of original plant communities broken by highway constructing does not occur as surface flow is disturbed. Recorded time and chorologic characteristics of that associated row of forest-bog systems broken by linear features, their disturbance degree and their reaction to hydrologic regime fluctuations allow predicting the degree of plant cover transformation under intensive anthropologic impact.Key words: Underflooding, Vegetation, Areal of transformation, Hydrological conditions.